I need help on this, the question in here:

Answer:

C.

Explanation:

The movement of the bow is Kinetic Energy.

Answer: C. Kinetic energy to sound energy

Explanation: The vibration of the string is kinetic energy that transforms into sound energy.

Answer:

No, because they can each have different number of neurons but be the same element

Answer:

The atomic number stands for the number of protons in an atom of the element.

The number of protons determines the identity of the element,

So the atomic number identifies the element. GOOD LESSONS ♡

Answer:

alkali metals

Explanation:

s block elements are also called alkali metals

Answer:

metal

Explanation:

Luster means Shiny. Dull means simple and not full of detail. Hope this helps!Please Rate Brainiest!

-Aslina

Answer:

Students heat up a metal sample by placing it into a test tube suspended in boiling water. Since the water is boiling, the metal evnetually reaches the same temperature as the boiling water: 100oC. ... Putting the metal sample directly into the water – obviously – gets it wet.

The metal is heated in a dry test tube in order to measure the capacity of the metal.

When performing a chemical experiment, it is important to

Instead of putting the metal straight into the boiling water, it is necessary to measure the capacity by heating it in a dry test tube first.

Read more here:

https://brainly.com/question/20552555

Answer:

The correct answer is "The β-sheet is a type of secondary structure that fulfills the hydrogen bonding requirements of amino acid side chains".

Explanation:

Hydrogen bonding are among the most common chemical bonds that occur between amino acids, where one atom of an amino acid acts as an hydrogen donor and the other acts as hydrogen acceptor. It is not true that β-sheet fulfills the hydrogen bonding requirements of amino acid side chains. β-strands are directional and form hydrogen bonds in antiparallel, parallel, or mixed arrangements. In the parallel form adjacent amino acids do not form hydrogen bonds, but they bond with the residues that flank the other.

The statement related to β-sheet that is considered to be false is that it should be the type of the secondary structure.

It is the bonding that should be arise mainly with the chemical bonds that lies between the amino acids where one atom should be acted as the donor of hydrogen and the other should be like an acceptor of hydrogen. Also, β-strands should be considered as directional and create the hydrogen bonds in the anti-parallel or mixed arrangements.

Learn more about bonds here: https://brainly.com/question/17957192

Answer:

Holmium

Explanation:

Electronic configuration:

             [Xe] 6s² 4f⁵ 5d⁶

To know this element, we must first find the atomic number and then look for its position on the periodic table.

     Number of electrons in [Xe] = 54;

  So the total number of electrons  = 54 + 2 + 5 + 6 = 67

This element has an atomic number of 57. On the periodic table, it is Holmium

Answer:

the mass will sink.

Explanation:

because the block of material is still more dense.

Answer:

32000 pounds

14741.752 kilograms

14741752 grams

16.25 tons

Explanation:

They are indeed placed from the far left hand side of the periodic table in almost the same column. If you step around the table between left to right, the movement of electrons rises by one. When you progress down the line, the number of power increases by the one.

Answer: cause oxegeon is harmful then helium

Explanation:

Answer:

a) 0.30

Explanation:

Kc = [C] [D] / ([A] [B])

Set up an ICE table:

[tex]\left[\begin{array}{cccc}&Initial&Change&Equilibrium\\A&0.4&-x&0.4-x\\B&0.4&-x&0.4-x\\C&0&+x&x\\D&0&+x&x\end{array}\right][/tex]

Plug in values and solve:

9 = x² / (0.4 − x)²

3 = x / (0.4 − x)

1.2 − 3x = x

1.2 = 4x

x = 0.3

Answer:

[tex]Fe_3PO_4[/tex]

Explanation:

To do this, we find the moles of each element. We get around 0.155 moles of Fe, 0.051 moles of P, and 0.206 moles of O. We then divide each one by the smallest one (which is 0.051 moles of P). We then get 3 for Fe, 1 for P, and 4 for O. This correlates to the empirical formula of the compound.

The empirical formula for the compound is [tex]Fe_3PO_4[/tex] if a 13.58 g sample of a compound contains 8.67 g of iron, Fe, 1.60 g of phosphorus, P, and oxygen, O.

An empirical formula tells us the relative ratios of different atoms in a compound.

We need to calculate the number of moles:

Given data:

Mass of iron - 8.67 g

Mass of phosphorus -1.60 g

Mass of oxygen -3.31 g

Moles of iron - [tex]\frac{mass}{molar \;mass}[/tex]

Moles of iron - [tex]\frac{8.67 g}{56 g/mol}[/tex]

0.15 mole

Moles of phosphorus [tex]-\frac{mass}{molar \;mass}[/tex]

Moles of phosphorus -  [tex]\frac{1.60 g}{31 g/mol}[/tex]

0.051 moles

Moles of oxygen -[tex]\frac{mass}{molar \;mass}[/tex]

Moles of oxygen - [tex]\frac{3.31 g}{16 g/mol}[/tex]

0.20 moles

Dividing each mole using the smallest number that is divided by 0.051 moles.

Fe:P:O :: 3:1:4

The empirical formula for the compound is [tex]Fe_3PO_4[/tex].

Learn more about empirical formula here:

brainly.com/question/14044066

#SPJ1

Answer:

1.55×10²² molecules.

Explanation:

We'll begin by calculating the number of mole in 5.32 g of pure lead (Pb). This can be obtained as follow:

Mass of Pb = 5.32 g

Molar mass of Pb = 207 g/mol

Mole of Pb =?

Mole = mass /molar mass

Mole of Pb = 5.32/207

Mole of Pb = 0.0257 mole

Finally, we shall determine the number of molecules in 0.0257 mole of Pb. This can be obtained as follow:

From Avogadro's hypothesis,

I mole of Pb contains 6.02×10²³ molecules.

Therefore, 0.0257 mole will contain = 0.0257 × 6.02×10²³ = 1.55×10²² molecules.

Therefore, 5.32 g of pure lead (Pb) contains 1.55×10²² molecules.

Answer:gamma rays

Explanation:

Answer:

nitrogen 18

nitrogen has an atomic number of 7

Answer:

5.30x10²³g

Explanation:

A mole can be understood as an amount of something.

One mole of eggs are 6.022x10²³ eggs

One mole of atoms are 6.022x10²³ atoms

One mole of molecules are 6.022x10²³ molecules

And 1 mole of M&M are 6.022x10²³ M&M. As 1 M&M weighs 0.88g, 1 mole will weigh:

0.88g*6.022x10²³ =

One mole of M&Ms will weigh  5.3 x 10²³ grams.

The given parameters

One mole of every substance contains 6.022x10²³ atoms of the substance.

Weight of an M&M, implies an atom of M&M.

1 atom --------- 0.88 grams

 6.022x10²³ atoms = ?

= 0.88 g x  6.022x10²³

= 5.3 x 10²³ grams.

Thus, one mole of M&Ms will weigh  5.3 x 10²³ grams.

Learn more about number of atoms in a substance here: https://brainly.com/question/15193101

Answer:

Ammonia > Urea > Ammonium nitrate > Ammonium sulphate

Explanation:

Percentage by mass of nitrogen in NH3:

Molar mass of NH3= 17 g/mol

Hence % by mass = 14/17 × 100 = 82.35%

% by mass of NH4NO3

Molar mass of NH4NO3 = 80.043 g/mol

Hence; 28/80.043 × 100 = 34.98%

% by mass of (NH4)2SO4;

Molar mass of (NH4)2SO4= 132.14 g/mol

Hence; 28/132.14 × 100 = 21.19%

% by mass of CH4N2O

Molar mass of urea = 60.0553 g/mol

Hence 28/60.0553 × 100 = 46.62%

Answer: I believe that it’ll be 284.45

Explanation:

May have to double check but I’m pretty sure that’s correct sorry if it’s not

Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\[/tex]

From the question

mass of coke = 21.36 g

volume = 20.5 mL

So we have

[tex]density = \frac{21.36}{20.50} \\ = 1.0419512...[/tex]

We have the final answer as

Hope this helps you

Answer:

erosion can be reduced by planting trees and other plants

Answer:

A

Explanation:

Answer:

Explanation:

The force acting on an object given the mass and acceleration we use the formula

From the question

mass = 142 g = 0.142 kg

acceleration = 9 m/s²

We have

force = 0.142 × 9 = 1.278

We have the final answer as

Hope this helps you

Answer:

1.28

Explanation:

In order for you to get the force you have to multiply the mass & acceleration. The baseball mass is 142 g and the acceleration is 9. So you will calculate 0.142 x 9 and that will give you 1.278. You will then round the 7 to an 8 and then you get the answer 1.28.

Answer:

C. 64

Explanation:

Given:

The number of equally likely sample outcomes of a single stage = 4

Unknown:

Total number of elements if there are three stages= ?

Solution;

Probability is the likelihood of an event to occur.

  In this problem;

      For a single stage, the likely outcome is 4

So therefore;

   For the 3 stages 4 x 4 x 4 = 64

Therefore, the total number of elements in the sample space of an experiment with 3 stages is 64

Answer:

Change in temperature = ΔT = 26.8°C

Explanation:

Given data:

Heat absorbed = 600 j

Mass = 25.0 g

Specific heat capacity = 0.897j /g°C

Change in temperature = ΔT= ?

Solution:

Formula:

q = mcΔT

600 j =  25.0 g ×0.897 j/g°C×ΔT

600 j =  22.425 j/°C×ΔT

ΔT = 600 j /22.425 j/°C

ΔT = 26.8°C

Explanation:

Some examples of colorful light emissions are street lights, neon signs and, of course, fireworks. Neon signs emit light when an electric current passes through the neon gas.

I'm pretty sure its momentum